Improper Weights on the Sprint Cup No. 18 Car

Looks like there was something amiss with Kyle Busch's car last weekend, but the issue was found during practice, not the race.

via press release

No. 18 NASCAR Sprint Cup Series Team Penalized For Rule Infractions

At Michigan International Speedway

DAYTONA BEACH, Fla. (Aug. 21, 2012) – NASCAR announced today penalties and fines to the No. 18 team that competes in the NASCAR Sprint Cup Series, as a result of rule infractions at Michigan International Speedway.

The No. 18 car was found to be in violation of Sections 12-1 (actions detrimental to stock car racing); 12-4J (any determination by NASCAR officials that the race equipment used in the event does not conform to NASCAR rules); and 20-2.3A (improperly attached weight) of the 2012 NASCAR rule book. The infraction occurred during practice on Aug. 18.

As a result of the violation, crew chief Dave Rogers has been fined $25,000 and placed on NASCAR probation until Oct. 3. In addition, car chief Wesley Sherrill has been placed on NASCAR probation until Oct. 3.